Radience

Circulation and Respiration

Science

alveolus

tiny, thin-walled sacs in the lungs where oxygen and carbon dioxide are exchanged between air and the blood
alveolus Simple Definition

artery

a blood vessel that carries blood away from the heart
artery Simple Definition

asthma

a disorder which narrows the airways to the lungs, making breathing difficult
asthma Simple Definition

atrium

one of the two upper chambers of the heart, it receives blood from the body
atrium Simple Definition

blood

the fluid that carries nutrients to the body’s cells and removes waste
blood Simple Definition

blood pressure

the force that the blood exerts on the walls of the arteries
blood pressure Simple Definition

bronchus

one of the two large tubes that connect the trachea to the lungs
bronchus Simple Definition

capillary

a tiny blood vessel that allows the exchange of gases, nutrients, and waste products
capillary Simple Definition

cardiovascular system

the heart, blood, and blood vessels that together transport nutrients to the entire body
cardiovascular system Simple Definition

circulatory system

the system of the heart, blood, and blood vessels, it moves oxygen, nutrients and waste
circulatory system Simple Definition

diaphragm

the muscle below the lungs that controls breathing
diaphragm Simple Definition

emphysema

a lung disease that destroys lung tissue and makes breathing difficult
emphysema Simple Definition

heart

the muscular organ that pumps blood through the body
heart Simple Definition

heart attack

the death of heart tissue due to a blockage of its blood supply
heart attack Simple Definition

hemoglobin

the iron-containing protein in red blood cells that binds to oxygen
hemoglobin Simple Definition

hypertension

blood pressure above the normal range, it is also called high blood pressure
hypertension Simple Definition

larynx

the voice box, it contains vocal cords
larynx Simple Definition

lung

the respiratory organ that absorbs oxygen from the air and removes carbon dioxide from the blood
lung Simple Definition

lymph

a clear tissue fluid that moves between the blood and the lymph vessels, it transports fats and aids the immune system
lymph Simple Definition

lymph node

an organ that filters pathogens from lymph, it contains lymphocytes
lymph node Simple Definition

lymphatic system

the nodes and vessels that return lymph to the blood, and help the body fight disease
lymphatic system Simple Definition

pharynx

the tubelike passage from the mouth, it carries food and air
pharynx Simple Definition

plasma

the liquid part of blood, it is clear yellow and contains blood cells
plasma Simple Definition

platelet

a cell fragment that helps form blood clots
platelet Simple Definition

pulmonary circulation

the flow of blood between the heart and the lungs
pulmonary circulation Simple Definition

red blood cell

a disc-shaped cell that uses hemoglobin to carry oxygen from the lungs to the body
red blood cell Simple Definition

respiration

the use of oxygen by cells to break down food, and release carbon dioxide and energy
respiration Simple Definition

respiratory system

the organs that transfer oxygen from the air to the body, like the nose, trachea and lungs
respiratory system Simple Definition

systemic circulation

the flow of blood between the heart and all parts of the body, except the lungs
systemic circulation Simple Definition

trachea

the windpipe, it carries air from the mouth and nose to the lungs
trachea Simple Definition

vein

a blood vessel that carries blood to the heart
vein Simple Definition

ventricle

one of the heart’s two lower chambers, it pumps blood out of the heart
ventricle Simple Definition

Related Chapters